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How to Use SQL Plan Management (SPM) - Plan Stability Worked Example (Doc ID 456518.1)

Last updated on JUNE 15, 2021

Applies to:

Oracle Database Cloud Exadata Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Oracle Database Cloud Service - Version N/A and later
Information in this document applies to any platform.

Goal

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SQL Plan management (SPM) is a preventative mechanism that records and evaluates the execution plans of SQL statements over time. SPM builds SQL plan baselines composed of a set of existing plans that are known to be efficient. The SQL plan baselines are then used to preserve performance of corresponding SQL statements, regardless of changes occurring in the system, providing "plan stability".

Common usage scenarios where SQL plan management can improve or preserve SQL performance include:

If you have a good plan in the cursor cache, then you can load these into SPM so that you can use this baseline to preserve the performance. The following example command illustrates this:

 

Solution

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